He will be responsible for technology strategy and implementation across all the agency's clients, which include Toyota, Google and Kellogg’s.
Davis, who has more than 15 years’ experience in a senior technology role, will report to Nick Bailey, the chief executive and executive creative director at Isobar.
He was previously the technical director at Maido, the digital agency. Before this he was the head of technology at OgilvyOne where he helped create the technology for The IBM 3D printing kiosk at the Wimbledon Tennis Championships and the British Airways Executive Club loyalty campaign with Mosaic.
Bailey said: "Emmanuel boasts a rare combination of capability, passion and personality that makes him the perfect fit for Isobar as we enter an exciting new chapter in the agency’s story."